lemmy/crates/db_views_actor/src/community_view.rs

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use crate::{community_moderator_view::CommunityModeratorView, person_view::PersonViewSafe};
use diesel::{result::Error, *};
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use lemmy_db_schema::{
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aggregates::community_aggregates::CommunityAggregates,
functions::hot_rank,
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fuzzy_search,
limit_and_offset,
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newtypes::{CommunityId, PersonId},
schema::{community, community_aggregates, community_block, community_follower, local_user},
source::{
community::{Community, CommunityFollower, CommunitySafe},
community_block::CommunityBlock,
},
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traits::{MaybeOptional, ToSafe, ViewToVec},
ListingType,
SortType,
};
use serde::{Deserialize, Serialize};
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#[derive(Debug, Serialize, Deserialize, Clone)]
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pub struct CommunityView {
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pub community: CommunitySafe,
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pub subscribed: bool,
pub blocked: bool,
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pub counts: CommunityAggregates,
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}
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type CommunityViewTuple = (
CommunitySafe,
CommunityAggregates,
Option<CommunityFollower>,
Option<CommunityBlock>,
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);
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impl CommunityView {
pub fn read(
conn: &PgConnection,
community_id: CommunityId,
my_person_id: Option<PersonId>,
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) -> Result<Self, Error> {
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// The left join below will return None in this case
let person_id_join = my_person_id.unwrap_or(PersonId(-1));
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let (community, counts, follower, blocked) = community::table
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.find(community_id)
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.inner_join(community_aggregates::table)
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.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
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.and(community_follower::person_id.eq(person_id_join)),
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),
)
.left_join(
community_block::table.on(
community::id
.eq(community_block::community_id)
.and(community_block::person_id.eq(person_id_join)),
),
)
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.select((
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Community::safe_columns_tuple(),
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community_aggregates::all_columns,
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community_follower::all_columns.nullable(),
community_block::all_columns.nullable(),
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))
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.first::<CommunityViewTuple>(conn)?;
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Ok(CommunityView {
community,
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subscribed: follower.is_some(),
blocked: blocked.is_some(),
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counts,
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})
}
pub fn is_mod_or_admin(
conn: &PgConnection,
person_id: PersonId,
community_id: CommunityId,
) -> bool {
let is_mod = CommunityModeratorView::for_community(conn, community_id)
.map(|v| {
v.into_iter()
.map(|m| m.moderator.id)
.collect::<Vec<PersonId>>()
})
.unwrap_or_default()
.contains(&person_id);
if is_mod {
return true;
}
PersonViewSafe::admins(conn)
.map(|v| {
v.into_iter()
.map(|a| a.person.id)
.collect::<Vec<PersonId>>()
})
.unwrap_or_default()
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.contains(&person_id)
}
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}
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pub struct CommunityQueryBuilder<'a> {
conn: &'a PgConnection,
listing_type: Option<ListingType>,
sort: Option<SortType>,
my_person_id: Option<PersonId>,
show_nsfw: Option<bool>,
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search_term: Option<String>,
page: Option<i64>,
limit: Option<i64>,
}
impl<'a> CommunityQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection) -> Self {
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CommunityQueryBuilder {
conn,
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my_person_id: None,
listing_type: None,
sort: None,
show_nsfw: None,
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search_term: None,
page: None,
limit: None,
}
}
pub fn listing_type<T: MaybeOptional<ListingType>>(mut self, listing_type: T) -> Self {
self.listing_type = listing_type.get_optional();
self
}
pub fn sort<T: MaybeOptional<SortType>>(mut self, sort: T) -> Self {
self.sort = sort.get_optional();
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self
}
pub fn show_nsfw<T: MaybeOptional<bool>>(mut self, show_nsfw: T) -> Self {
self.show_nsfw = show_nsfw.get_optional();
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self
}
pub fn search_term<T: MaybeOptional<String>>(mut self, search_term: T) -> Self {
self.search_term = search_term.get_optional();
self
}
pub fn my_person_id<T: MaybeOptional<PersonId>>(mut self, my_person_id: T) -> Self {
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self.my_person_id = my_person_id.get_optional();
self
}
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pub fn page<T: MaybeOptional<i64>>(mut self, page: T) -> Self {
self.page = page.get_optional();
self
}
pub fn limit<T: MaybeOptional<i64>>(mut self, limit: T) -> Self {
self.limit = limit.get_optional();
self
}
pub fn list(self) -> Result<Vec<CommunityView>, Error> {
// The left join below will return None in this case
let person_id_join = self.my_person_id.unwrap_or(PersonId(-1));
let mut query = community::table
.inner_join(community_aggregates::table)
.left_join(local_user::table.on(local_user::person_id.eq(person_id_join)))
.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
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.and(community_follower::person_id.eq(person_id_join)),
),
)
.left_join(
community_block::table.on(
community::id
.eq(community_block::community_id)
.and(community_block::person_id.eq(person_id_join)),
),
)
.select((
Community::safe_columns_tuple(),
community_aggregates::all_columns,
community_follower::all_columns.nullable(),
community_block::all_columns.nullable(),
))
.into_boxed();
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if let Some(search_term) = self.search_term {
let searcher = fuzzy_search(&search_term);
query = query
.filter(community::name.ilike(searcher.to_owned()))
.or_filter(community::title.ilike(searcher.to_owned()))
.or_filter(community::description.ilike(searcher));
};
match self.sort.unwrap_or(SortType::Hot) {
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SortType::New => query = query.order_by(community::published.desc()),
SortType::TopAll => query = query.order_by(community_aggregates::subscribers.desc()),
SortType::TopMonth => query = query.order_by(community_aggregates::users_active_month.desc()),
SortType::Hot => {
query = query
.order_by(
hot_rank(
community_aggregates::subscribers,
community_aggregates::published,
)
.desc(),
)
.then_order_by(community_aggregates::published.desc());
// Don't show hidden communities in Hot (trending)
query = query.filter(
community::hidden
.eq(false)
.or(community_follower::person_id.eq(person_id_join)),
);
}
// Covers all other sorts
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_ => {
query = query
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.order_by(
hot_rank(
community_aggregates::subscribers,
community_aggregates::published,
)
.desc(),
)
.then_order_by(community_aggregates::published.desc())
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}
};
if let Some(listing_type) = self.listing_type {
query = match listing_type {
ListingType::Subscribed => query.filter(community_follower::person_id.is_not_null()), // TODO could be this: and(community_follower::person_id.eq(person_id_join)),
ListingType::Local => query.filter(community::local.eq(true)),
_ => query,
};
}
// Don't show blocked communities or nsfw communities if not enabled in profile
if self.my_person_id.is_some() {
query = query.filter(community_block::person_id.is_null());
query = query.filter(community::nsfw.eq(false).or(local_user::show_nsfw.eq(true)));
} else {
// No person in request, only show nsfw communities if show_nsfw passed into request
if !self.show_nsfw.unwrap_or(false) {
query = query.filter(community::nsfw.eq(false));
}
}
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let (limit, offset) = limit_and_offset(self.page, self.limit);
let res = query
.limit(limit)
.offset(offset)
.filter(community::removed.eq(false))
.filter(community::deleted.eq(false))
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.load::<CommunityViewTuple>(self.conn)?;
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Ok(CommunityView::from_tuple_to_vec(res))
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}
}
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impl ViewToVec for CommunityView {
type DbTuple = CommunityViewTuple;
fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
items
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.iter()
.map(|a| Self {
community: a.0.to_owned(),
counts: a.1.to_owned(),
subscribed: a.2.is_some(),
blocked: a.3.is_some(),
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})
.collect::<Vec<Self>>()
}
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}